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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cb68907096947a4a366b7fe66e056837390c2c9245681966f14674af374273' 
  AND token = 'VADkbTnjA5d/BBhi3vrcR5OsDtXtphGMISkZH6jwgO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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