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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d19118880e3e63eec0d4120d81b3efb706bd41b36511503cf0f8ebb2a4da102' 
  AND token = 'm4yDyrJYjBJslmxT7riRf/VBdAZiEJ66eJi1hGzdGlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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