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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0b4e1b1205c99653e79216ebc04ca9518bae1684f9e31360e81e59640b0da4' 
  AND token = 'rn28zMKvN94T8OgydbyuLsNFf42ar3CdfPlMahdsJLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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