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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef9e4889bad24e56f2ba2fea9d631c428ba75af6d6a080cce841198678731dd' 
  AND token = 'sgoORS+lQ+GVWsilLMfIHwlknWQrt4+EEKI0RZySb1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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