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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c1e38b0901f9323eb0af46b8404953cf45aee716f622f6764267e10a868650' 
  AND token = '5Q9q+yngsRxrVNZO96sac2IMKFSgDdLE/87jW006K+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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