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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d49b86e6303128f0eaec0073549dbee7e3e9ca7ca8564930512498d0361e41' 
  AND token = 'e6HvGcK3CHLqmYo943fIyz8t2NH5dqEraAMlilggXAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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