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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e198f114443930d335b29a4d9ec653b2b05715b134f2904d11067410a837bee' 
  AND token = 'yVLC7NEbL7lHqAo/W5fAU44DgqH895dbBuDnutlOLWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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