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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4ccf58883605a2a314c5b3771f2bed679fc76a175bf524e56c6ec5dad39a83' 
  AND token = '1dkakL+2xU2GltsQbmm01BGc2gB93Gdncwbq46U+5m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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