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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb610c0329617536c3fac333c653c74ebd47d034a840fb0a8d794f15c8eadffd' 
  AND token = 'nkmBMBXKUwkD0CT4od6fw2KiWJFJArqdwi8YToE7XqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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