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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4481a56fffe3de5f83a6df03f9f8ef48c1b402f4cbde07de3d4d8766eb53ed97' 
  AND token = 'aJLekA34e1SSia5HZ7vtNWobqo2VSjumhdB/JeIh1Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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