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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a829ee2f86f9a832bb88835c6fbbe23b0ab7f827284431afb7a617bb977180' 
  AND token = 'GbXJFaJQHEkOlDQ/746P7uUL/rQF0KoIK33YOpVduzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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