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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ad24bce6c0e8b701f7a78f43d63f19652746bfdd1f9cc4251e520a3d079d8b' 
  AND token = '3Mds7u8Ry4SciJOEVIVJgWgESCQ7y5Z3ObYvfMi3Zpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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