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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bd0d5627bf47185d0ff352203817495f8588936844d0b3c7a4a7d1c05bb4f7' 
  AND token = 'HgmBly0Ibd4nbPB55ooemQuYljaqfjIF2wix2o0ivOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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