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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ca416e5cdfce5c9d9f3e7ea3b14d6fcfffc8be3752b6460a90a02dd22ab863' 
  AND token = 'q+JwhDtFu4wM5WD4r6z22dBdKQFYNpBOz+TJmkO1t4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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