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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c15f10c0d8524a2f3307c19736e2a8fc1f729fcbb4c181f5021bacd71d6ceb' 
  AND token = 'N9dx4TdyAIw9FFGoc06QGEJ432aPJb//acruMNVPMyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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