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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa02b99515a077f77736a1238ec5d86d6c93f31eb8231a88fb2f3c0280769597' 
  AND token = '8Stiy5cPPbVCdxoGtR2+X9anxy2olagUrmITAg+RgtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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