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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c7c7dc9fef808b58e07470543105157d085a9f21ee3133315e2d4ef8ad2d61' 
  AND token = 'L8+5k6sFkAD/aASw+gwztUUHpE3U87D6JnUedcbolv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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