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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93786d3bd59e1043d2e20eb5aa09bab341fae5e4995b7047c91a2925a0d27cd6' 
  AND token = 'RFl8YFMGisqLfUAUImBRWLEKsHs5YDntBpH0R1SFXK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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