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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fb59a2829513a9fba4206345ec2d33bbfcff8767efadd9fe490fc5de5315f8' 
  AND token = '8Sju/s4l2AmLzQbcxqUnO3rpMvoKBEbzvjscWg4SIs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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