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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32810509afa707adcd55dfc39b9996918b3c10d44550c9f2ef6685fc19338db6' 
  AND token = 'hnT94sc87eZ7eK1TOnq9DIjhas9PMEpDuM0CKS+1g4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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