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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32dc8f477bf3d4342f51018d99eda8a9a0a85a5f380f088c712de18c816c2b5' 
  AND token = 'WVBkLsFe3x77RAIqNwV9t76b8XvGKsEuLSAfm0X8GXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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