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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d2ec2c05afc81bf9b2c9a2fb128df21187ea622b963324a22adc6bf8ec2cd0' 
  AND token = 'Eu/QRsH+xEIVsLtp7XRpzGeZKG/igePkRBDx827nSkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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