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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5d0c7ac37d1400e653a8469f3cf9c7a9e7e670150a868d5724a6062e22be20' 
  AND token = 'J+ppW1izN3MLypYC/25oCvZom5n05wnFenckZsC0QXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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