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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d573bf80938cdcd54851ea2e68aa6190f9d343aedc396f652bf6f6dd1cca355' 
  AND token = 'ln9R+gy565KrlxACb8au9uLybNIwIaKyEtELMkNZk1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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