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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5a9eefc0777e478113142d1edd2d06b787688a255454d080a59d47a23a472d' 
  AND token = 'WltlElBidCM+6plD9phah+5b0L9omTA4t+RBM6oQ38U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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