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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1306a00265cb5c103f805f8d3187e1a82ef9a986a43b6ddcced4c43cd06d1f7b' 
  AND token = '//67p1cT9NC7PrCLP+7ce1Cn7dgaLGKCOreM1c9/2NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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