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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004e766c424391b790296cb197cafd36e35c9f6d6fc8f86050a82d2032c3e38e' 
  AND token = '+AwbL/3rxN6ZY5cx0/Wsp+UnwoOxn2RuxHQ3gpl92NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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