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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93279f76a6bdd7d8c612d983bfa8decfbd2dae6a0c8dddd45a65d7849d44251d' 
  AND token = 'LF0sufC06COkUzzXTTxQ4y3keDE4Cd7RrRlJD+u2PYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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