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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863c352f31fa7fcc4b71d354b8d4880789c031b7d2dd9622e904b4a0301328fa' 
  AND token = 'hc6Lijc3BRhAO9YimTivPd6hKkrZ8FK6n+gB3BPDUtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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