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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bba31b57ef263ddcde7a090ac7f11e42c31bf5d57d91ee5cc5a9dc1072e75c' 
  AND token = 'IqcNkZAXeWxV6FxsZvtE2AR/QaOnZbYO+cz9l/zr+Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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