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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee82ed110b2b4223878cb47587e5865556e1eb1e59581c7828790a0a98c763ed' 
  AND token = 'e646WfGdLdtu1z0+Nz8dzGULX5pkD6xba00nVIMyPpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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