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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a8f847aa13a5f7cd534101c466a9ea998ff27513071d5f10b1f7db9d83ffc3' 
  AND token = 'NM9nRmLzROSK5TeUEkHsxOh77YjasFSM/0jVV2poLxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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