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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14aefb8e1cd8723e0ecac913535e3766ed4c7417da1c4c43b20b0abdd5cd2bb5' 
  AND token = 'MuCcHHzRII6Ipho5iMeyys55Ht8UYTgI4IyFyXATyZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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