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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857dbc445fc5912691630451b4759c31d555159550ddabccb413e1f7b614f71e' 
  AND token = 'Rq63tw/bHYtPHBR9KAKtV0YjY32sFs9dCKzbt5QMwNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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