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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0dcebcfef9ee65a1e3d65b14d94b7cd7a9e595e2f31d8d851129f354776f22' 
  AND token = 'g5ezKmBkkAh2JbQ/IUmpKxQjrrgBzNkS5q4boM0DXJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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