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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8d1c7c4ac5aabb0c50beb118b16002615a802122e7760c331ee0c14a27ea8e' 
  AND token = 'HkJOYfh6IPPvY4k265wmdCZ+g9QCxjH4wCnuhOae2hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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