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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86989bb2ed5ea054058334c4e5c84ee11f292371e8dbd885ac2bb8a5b582a88' 
  AND token = 'Lhad6svxA4nazQq2vbjc3QkihJ/bngeN5blo91bcgoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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