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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfdff281e61a564e62e3c9b31af655ece38caf762af4b3c9af1f77fb274af41' 
  AND token = 'GCsmsiYMzb4WiAgX4pSiqeiKQn5Y5pLUgcIr+WC9IzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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