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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4791c41439ae4c926e0eb2a9a5ec3231179fc4f088f0942125101510c8095675' 
  AND token = 'h7JWWKbS/3Wx9twISVFg6xHRg4beDzYd2mDRgpZ67cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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