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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82fce8d038b963d0946b16dddf89c2a312d61ac4e9b13a3185aa01e60c61117' 
  AND token = 'iY7orcQL9fLHfQV9z2Fqu3S4TDiHygJ1F0YOn0Mdza0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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