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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c162e10907c2bb23beba50f613ab50ea45bf2ccb100c8759749ec583c3b58b' 
  AND token = 'yx6gn222UmjNwUhG9dUuLwiK7492yMD13t242+Ot3Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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