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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eea2e13f6964bb820121c9318845f2b21bc11c6c59c81e906e83b82096e7a66' 
  AND token = 'Lpg3E2PC0HJLG37Z4JTnwtJZYL+GA5TqBH4LAUQ/cZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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