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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde99e0caac63664086200147c6a729ab1112d26ff4e495e76b0a4e46c06fa75' 
  AND token = '7SBevkj5Mc1W2ohewfjgeUANtg5phsbSURA023Agx9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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