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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb5b7f98761647639408d34b5299e784174d5cf635317fa5965bb3318b668b4' 
  AND token = 't+VovQVuhLPRKkNhWAK5+5aby7yzywH8yt67uPfla6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}