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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901c9af4340bfdfdc54218c722c847e9b69ed18803a565e393eec54e3e2460f2' 
  AND token = 'ROEGGUgW5iqc4JpqpO3rGxzSaDvuJyq+JZIP4v3uvOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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