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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d300ef65df5e3a735568224dc388f323ad8869d5f5e9e9e96c158148b6747c' 
  AND token = 'E29FqMs6yqUc5wGeA8eKSyg6r/bfphHifU9b6meoJHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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