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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9df6d45416503ab83f50553c21030eb2c7ff40a2db03384e6ed9bc07b8c0e1' 
  AND token = 'GOESgQA7VeDvn6ivtjZHjUAGm/czV+aPl+lNfHO93Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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