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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d70c2a979affd60e69be61721a8e415b71e835668a1855bfd35a9b9e7745868' 
  AND token = 'T5NcCaLA1/zS6xBBoZBHyWVOQl0uc1bYzXfQ6LgCUv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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