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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30febd76f1678562b4cc37a7ec4958a8090737e3eec219bbe284d03f9b88e84e' 
  AND token = 'C+s18bO8M0qib7Oq75NVUWBcKHQwTnLsqvkTfB45dcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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