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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a38bc5eace13b44bb96bd3e25a646bcf99d4d78cdf420a2c23b12e8808327a8' 
  AND token = 'UtvFXPKRp5ux5S6N0FptgFio9WJ7gXQs0sgcNGLy0eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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