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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56df06ea6435cc3c27c7165e9b1f02f996de91e6da2b5b19cef62201e38e4400' 
  AND token = 'Jf4XdcShlpT7vg6+/Ct2PFA6lU75K53kOxnh+TyyO0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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