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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdc612c55e66ea586fed07ac09ba43d118d36a2beca4ad4ef676a3054e4d551' 
  AND token = 'UzXFAOcoLopI/irFvnK9qBTEpDTc6ug3Vev2YLnEn2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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