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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bece6f001ea7c05f6938b8acfba9658471d704cdac32d6572e62a3ee2f9b19b4' 
  AND token = '4B8oihUAER7hNQjTFDiqJfkKQ0ShsL+Q0rMGsWGTC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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