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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8920770b30b37682fadfac27fb32873761073b4028aae1663dd2a409d2db0f2d' 
  AND token = 'ErXNoDU1yPVYct2wokpiomCNP5UbxBR/nv9BqOyoL0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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