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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e8d47a3bfb8c490590cb657e2774a6aacac9bfab22767a88f9642be038f2a6' 
  AND token = 'pVnKaz7FTaHw9SaUbqquYF21lH4qje2i8YmV+zMP+GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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